西南交通大学学报

Influence of Local Stress Variance on Elastic Stability of Compression Bar

LI Xiaozhen, XIAO Jun, LIU Dejun, LIU Chenguang, ZHANG Jingfeng, XIAO Lin

2015, 28(6): 971-976. doi: 10.3969/j.issn.0258-2724.2015.06.001

[Abstract](816)

Abstract:
To discuss how the elastic stability of compression bar is affected by local stress variances with different loading patterns, the finite element (FE) method was adopted to study the stability performance of compression under the single-point loading and surface loading. A 2-D plane beam was taken a...

Experimental Study and Prediction Model for Concrete Creep in Ambient Environment

YANG Yongqing, LU Weiwei, LI Xiaobin, YU Xiaohua

2015, 28(6): 977-983,1010. doi: 10.3969/j.issn.0258-2724.2015.06.002

[Abstract](931)

Abstract:
In order to accurately predict structural concrete creep, utilizing the benchmark creep coefficient under constant temperature and humidity, temperature creep coefficient and moisture creep coefficient were introduced to develop the combination creep model for concrete exposed to the actual ambient ...

Mechanical Performance Analysis of Reinforced Soil Walls with Flexible/Rigid Facings

LIU Junxiu, CHEN Jianfeng

2015, 28(6): 984-992. doi: 10.3969/j.issn.0258-2724.2015.06.003

[Abstract](877)

Abstract:
A three-dimensional numerical modelling of a reinforced soil retaining wall (RSW) with flexible/rigid facings was established based on the results of centrifugal model tests. The influence of different anchor embedded depths, anchor stiffness, vertical spacing of anchor layers,reinforcement stiffnes...

Experimental Study on Shear Strength Characteristics of Irregular Rock Mass Discontinuities

ZHANG Julian, SHEN Mingrong, LIANG Zhirong

2015, 28(6): 993-1000. doi: 10.3969/j.issn.0258-2724.2015.06.004

[Abstract](763)

Abstract:
To study on mechanical properties of irregular discontinuities in rock mass engineering, conventional shear tests under different normal stress were carried out with No.1, 4, 6, 8, 10 standard discontinuities proposed by Barton, and simulated with cement mortar specimens. Based on experimental data ...

Cable-Beam Vibration Characteristics of Cable-Stayed Bridge under External Excitations

WANG Tao, SHEN Ruili

2015, 28(6): 1001-1010. doi: 10.3969/j.issn.0258-2724.2015.06.005

[Abstract](820)

Abstract:
To understand the effect of external excitations on the cable-beam vibration of large-span cable-stayed bridge, firstly, the theoretical equation for the large-amplitude cable vibration was built, and based on nonlinear vibration theory, the dynamic cable element was developed using finite element m...

Fatigue Evaluation Approaches of Welded Joints on Orthotropic Steel Bridge Deck

CUI Chuang, LIU Yiming, LIAO Guixing, ZHANG Qinghua, BU Yizhi

2015, 28(6): 1011-1017. doi: 10.3969/j.issn.0258-2724.2015.06.006

[Abstract](801)

Abstract:
The traditional fatigue evaluation approach for orthotropic steel bridge deck is not sufficiently accurate. To accurately evaluate the fatigue properties of welded joints on a orthotropic steel bridge deck, the validities and accuracies of the structural stress method and the notch stress method wer...

Precise and Approximate Methods to Calculate Shrinkage and Creep Effects of Simply-Supported Composite Beam

ZHOU Donghua, HAN Chunxiu, YANG Tianyuan, YANG Yingen, WANG Yongshuang

2015, 28(6): 1018-1024. doi: 10.3969/j.issn.0258-2724.2015.06.007

[Abstract](747)

Abstract:
To provide a simple and feasible calculation method, differential equations for composite beam with creep and shrinkage were derived and solved based on the Dischinger's method by using exact and approximate methods respectively. When the exact method is adopted, the coupled differential equations n...

State-of-the-Art of Dynamic Seismic Reliability Theories of Structures

LÜ, Dagang, SONG Pengyan, YU Xiaohui, QIAO Yumeng

2015, 28(6): 1025-1038. doi: 10.3969/j.issn.0258-2724.2015.06.008

[Abstract](915)

Abstract:
The state-of-the-art of theories on dynamic seismic reliability of structures is systematically reviewed from three aspects: state variable models, basic variable models, and pragmatic simplified models. For the state variable models, using the random vibration theory, methodologies for random vibra...

Investagation and Analysis of Seismic Damage to Cultural Heritage Buildings Induced by Gorkha Earthquake, Nepal

PAN Yi, XIE Dan, YUAN Shuang, SHEN Zhongwei

2015, 28(6): 1039-1046. doi: 10.3969/j.issn.0258-2724.2015.06.009

[Abstract](757)

Abstract:
An extensive investigation was made to reveal the damage caused by the 2015 Gorkha, Nepal earthquake to the cultural heritage buildings in Kathmandu Valley. The typical seismic damages are described by classifications of brick-timber structure, masonry structure and raw-soil structure, and seismic d...

Probability Density Evolution Analysis of Nonlinear Seismic Response of Structures with Random Parameters Following Different Distributions

YANG Junyi, CHEN Jianbing, LI Jie

2015, 28(6): 1047-1054. doi: 10.3969/j.issn.0258-2724.2015.06.010

[Abstract](925)

Abstract:
The randomness of structural parameters should be reasonably taken into account to assess the global performance of complex structures subjected to seismic actions. In the present paper, incorporating the generalized F-discrepancy (GF-discrepancy) based optimal point selection strategy and the proba...

Effects of Jiuxiang Fracture on Abnormal Intensity in Hanyuan during Wenchuan Earthquake

LI Ping, BO Jingshan, YUAN Yifan, XIAO Ruijie, LIU Hongshuai

2015, 28(6): 1055-1060,1073. doi: 10.3969/j.issn.0258-2724.2015.06.011

[Abstract](750)

Abstract:
In order to explore the causes for abnormal intensity occurring in Hanyuan Town during the Wenchuan earthquake, a typical two-dimensional model for seismic response analyses was established based on the scientific investigation and site reconnaissance of earthquake damages in Hanyuan Town and the se...

Water-Rock Interaction Characteristics and Softening Mechanism of Calcareous Mudstone

WANG Zhen, SHEN Mingrong, LIU Ang

2015, 28(6): 1061-1066. doi: 10.3969/j.issn.0258-2724.2015.06.012

[Abstract](861)

Abstract:
In order to deeply research the softening mechanism of soft rock after interaction with water, cretaceous calcareous mudstone, water softening rock from a water diversion tunnel in Guyuan City, Ningxia Hui Autonomous Region, was investigated by the analysis of its mineral compositions and the test o...

Optimization of Nose Depth for Rigid Frog

CAO Yang, WANG Ping

2015, 28(6): 1067-1073. doi: 10.3969/j.issn.0258-2724.2015.06.013

[Abstract](797)

Abstract:
Based on wheel-rail contact relationship and dynamic interaction when wheel treads pass from wing rail to nose rail, a design and evaluation method for nose depth selection of key cross-sections was proposed to select reasonable nose depths for rigid frog. A train with LMA wheel treads passing over ...

Effect of Longitudinal Geometric Irregularities of Wheel and Rail on Dynamic Behavior of Metro Vehicle Driven by Linear Motor

XIONG Jiayang, CAO Yabo, WU Lei, DU Xing, XIAO Xinbiao, JIN Xuesong

2015, 28(6): 1074-1081. doi: 10.3969/j.issn.0258-2724.2015.06.014

[Abstract](736)

Abstract:
A metro vehicle-track coupling dynamic model was established to investigate the effect of geometric irregularities of wheel and rail on the dynamic behavior of linear motor vehicles, which was based on the vehicle-track coupling theory and took the linear induction motor subsystem into account. Thro...

Multi-mode Vibration Attenuation Track in Low-Frequency Domain

YANG Jizhong, ZHANG Lei, CAI Chengbiao, YAN Hua

2015, 28(6): 1082-1087. doi: 10.3969/j.issn.0258-2724.2015.06.015

[Abstract](704)

Abstract:
For the phenomenon of low-frequency environmental vibration caused by the urban rail transit, based on the extended fixed-point theory, the passive vibration controlling technology, the finite element method and the vehicle-track coupling dynamics, a design method is developed to analyze the multi-m...

Sliding Mode Control for Vehicle Following System with Stochastic Disturbances

SHI Jizhong, ZHANG Jiye, XU Xiaohui, HU Yongju

2015, 28(6): 1088-1093. doi: 10.3969/j.issn.0258-2724.2015.06.016

[Abstract](653)

Abstract:
A vehicle following system and the corresponding vehicle dynamics model were set up to verify the feasibility of applying sliding mode control in vehicle following system with stochastic disturbances. A controller for the system was designed by sliding mode control method. The stability of the contr...

Estimation of Longitudinal Speed of In-wheel Motor Driven Vehicle Using Fuzzy Extended Kalman Filter

WANG Zhifu, LIU Mingchun, ZHOU Yang

2015, 28(6): 1094-1099. doi: 10.3969/j.issn.0258-2724.2015.06.017

[Abstract](715)

Abstract:
In order to obtain the longitudinal speed of the in-wheel motor driven vehicle, a new estimation algorithm for the extended Kalman filter was designed based on signals of wheel speed and vehicle body acceleration. First, the discrete state equation and measurement equation of the research object wer...

Characteristics Analysis of Sound Radiation of Box Girder Based on Transient Boundary Element Method

YIN Qiang, CAI Chengbiao, CHEN Zhaowei

2015, 28(6): 1100-1105. doi: 10.3969/j.issn.0258-2724.2015.06.018

[Abstract](752)

Abstract:
Based on the finite element-transient boundary element method, the time-domain vibration characteristics and the acoustic radiation characteristics of a 32 m-span simply supported box girder railway bridge were analyzed. Firstly, the rail-bridge finite element model was established utilizing the fin...

Characteristics of Ride Comfort and Torsion Elimination of Four-Corner Interconnected Air Suspension System

JIANG Hong, QIAN Kuan, ZHU Chao, SUN Yuzhou

2015, 28(6): 1106-1113. doi: 10.3969/j.issn.0258-2724.2015.06.019

[Abstract](706)

Abstract:
In order to improve the ride comfort and decrease the vehicle body torsion load on uneven roads, a four-corner interconnected air suspension system was proposed. Based on the engineering thermodynamics and the vehicle dynamics theory, a vehicle dynamic model equipped with the four-corner interconnec...

Design and Optimization of Control Strategy for Plug-in 4WD Hybrid Electric Vehicles

QIAN Lijun, QIU Lihong, XIN Fulong

2015, 28(6): 1114-1121,1129. doi: 10.3969/j.issn.0258-2724.2015.06.020

[Abstract](709)

Abstract:
In order to identify drivers' intentions, and improve the fuel economy of plug-in 4WD hybrid electric vehicles (HEVs) with their power performances guaranteed, a method for calculating the torque identification coefficient was put forward. An energy management control strategy was designed based on ...

A New Multi-kernel Discriminant Analysis

LIANG Jun, ZHANG Feiyun, CHEN Long, LI Shihao, GU Shengqiang, ZHANG Wanwan

2015, 28(6): 1122-1129. doi: 10.3969/j.issn.0258-2724.2015.06.021

[Abstract](669)

Abstract:
In order to provide effective means for pattern classification and dimension reduction and stem from the advantages of two kinds of multi-kernel namely L1-MKDA and L2-MKDA, a new type of semi-infinite-programming-based flexible multi kernel discriminant analysis method was proposed, which is based o...

Matching Characteristics between Four Kinds of Wheel Steels and U71Mn Hot-Rolled Rail

LIU Jihua, WANG Wenjian, LIU Qiyue

2015, 28(6): 1130-1136. doi: 10.3969/j.issn.0258-2724.2015.06.022

[Abstract](677)

Abstract:
In order to investigate the effect of wheel materials on the matching behaviors between wheel and rail, the MMS-2A wear test machine was used to simulate the friction and wear behavior of the wheel/rail systems made of U71Mn hot-rolled rail and four kinds of wheel materials. The wear loss was measur...

Probability Analysis of Negative Phase-Sequence Current for High-Speed Railway Traction Substation Based on Measured Data

WANG Bin, ZHANG Ming, QIU Zhongcai, HAN Xudong, JIANG Xiaofeng

2015, 28(6): 1137-1142. doi: 10.3969/j.issn.0258-2724.2015.06.023

[Abstract](841)

Abstract:
In order to study the problem of current unbalance in the traction power supply system of high-speed railway, the stochastic process of loads in traction substations and the negative-phase sequence current feature of V/v connection transformers are analyzed, and a negative phase-sequence current pro...

Physical Modeling of IGBT and Its Parameter Identification Method Based on Neural Network

SUN Yue, TAN Jingjing, TANG Chunsen

2015, 28(6): 1143-1149,1163. doi: 10.3969/j.issn.0258-2724.2015.06.024

[Abstract](807)

Abstract:
In order to obtain the special model of insulated gate bipolar transistor (IGBT), and realize targeted optimization of the IGBT circuit, the IGBT during its on and off state was modeled separately based on Hefner model and the transient was analyzed. Meanwhile, the model parameter identification met...

Linear Elastic Nonequivalence Force for Dynamic Flow Balance Valve in Opening and Closing Process

LI Shuxun, XU Juanjuan, FAN Yilin, XU Xiaogang, YE Chen

2015, 28(6): 1150-1155. doi: 10.3969/j.issn.0258-2724.2015.06.025

[Abstract](700)

Abstract:
In order to solve the problem that the flow rate control of a dynamic flow balance valve cannot meet the precision requirement, a dynamic model for the balance valve and the motion equation of the valve core were developed. Then, the three-dimensional flow model of the valve core with the same diame...

Extraction of Forest Density Based on Airborne LiDAR and Mean Shift Algorithms

CHEN Wei, YANG Minhua, HONG Yifeng, LI Fei

2015, 28(6): 1156-1163. doi: 10.3969/j.issn.0258-2724.2015.06.026

[Abstract](626)

Abstract:
To extract forest density, Mean Shift segmentation algorithm is explored for point clouds processing. The first step is to use the Mean Shift algorithm for the point clouds initial segmentation depended on feature vectors, bandwidth and thresholds. Feature vectors consist of three-dimensional coordi...

Traffic State Identification for Urban Expressway Based on Projection Pursuit Dynamic Cluster Model

BING Qichun, GONG Bowen, YANG Zhaosheng, LIN Ciyun, QU Xin

2015, 28(6): 1164-1169. doi: 10.3969/j.issn.0258-2724.2015.06.027

[Abstract](727)

Abstract:
In order to improve the accuracy of traffic state identification for urban expressway based on the spot traffic parameters, a traffic state identification method based on projection pursuit dynamic cluster model was proposed using the mapping relationship between spot traffic parameters and traffic ...

Road Spectrum Analysis of High-Speed Rocket Sled Rail Based on Shock Response Spectrum

DONG Longlei, ZHANG Jingjing, ZHAO Jianping

2015, 28(6): 1170-1174. doi: 10.3969/j.issn.0258-2724.2015.06.028

[Abstract](686)

Abstract:
In order to evaluate the ride comfort of the high-speed rocket sled rail, an analysis method of dynamic road spectrum based on the rail's dynamic response is presented. In this method, the rocket sled test system is regarded as a sled-rail coupling system, the rail's dynamic response is used as the ...

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2015 Vol. 28, No. 6